MP3, OGG export fails with crash

14:28:36.241 | WARN | main_thread | Qt | QQmlComponent: Created graphical object was not placed in the graphics scene.
14:28:36.705 | WARN | main_thread | Qt | QQmlComponent: Created graphical object was not placed in the graphics scene.
14:28:39.897 | INFO | main_thread | ActionsDispatcher | dispatch: try call action: file-export
14:28:39.938 | WARN | main_thread | Qt | QObject::connect(QQuickItem, mu::uicomponents::PopupViewCloseController): invalid nullptr parameter
14:28:39.938 | WARN | main_thread | Qt | QObject::connect(QObject, mu::uicomponents::PopupViewCloseController): invalid nullptr parameter
14:29:19.798 | WARN | main_thread | Qt | QObject::connect(QQuickItem, mu::uicomponents::PopupViewCloseController): invalid nullptr parameter
14:29:19.798 | WARN | main_thread | Qt | QObject::connect(QObject, mu::uicomponents::PopupViewCloseController): invalid nullptr parameter
/tmp/.mount_MuseScdMEPD5/AppRun: Zeile 26: 18192 Getötet "${APPDIR}/bin/mscore4portable" "$@"

I am using :
Linux 5.19.0-43-generic #44~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon May 22 13:39:36 UTC 2 x86_64 x86_64 x86_64 GNU/Linux with KDE and Ubuntu 22.04.2 LTS
And I am using the actual MuseScore AppImage file.
There seems no export possible! Does anybody has a hint?
Thanks a lot in advance!